TIVERTON — The threat was as flimsy as the paper it was printed on, but the charges against a teenager are much more solid, police said.

Alexander Wahl, 18, 2 Old Bulgarmarsh Road, was charged with threatening to place a bomb in a public place on March 18, one day after he notified school officials that he found a written bomb threat in a boy’s bathroom.

“We got a call from the high school on March 17 that a student said he found a threat, printed on toilet paper,” police Capt. Patrick Jones said. “The threat said a bomb would go off on Wednesday, March 19.”

Wahl, police alleged, delivered the threat to school officials at 2:47 p.m., after students had been dismissed for the day.

Police ordered the school evacuated and then the building was searched by bomb squad experts with the state fire marshal’s office and with state police troopers accompanied by bomb-sniffing dogs.